Nicholas, David,  1947- <br/><br/>
Online information sources for business and current affairs  an evaluation of texline, nexis, profile and dialog 
David Nicholas and Gertrud Erbach. 
 - London  Mansell Publishing  1989. 
 - 297 pages ;  24cm. 
<br/><br/><label>ISBN: </label>0720118786 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information storage and retrieval systems--business--handbooks, manuals, etc<br/>Information storage and retrieval systems--Political science--Handbooks, manual, etc.<br/>Business--Data bases--handbook manuals etc